Chael Sonnen

Chael Sonnen was just two minutes away from a decision victory over Anderson Silva at UFC 117 before Silva miraculously sunk in a fight ending triangle choke and walked away with his middleweight belt.

Many fans called for a rematch, convinced that Sonnen could replicate his success and possibly defeat one of the greatest champions in UFC history.

But it was soon revealed that Sonnen had unusually high levels of testosterone in prior to his fight with Silva and was suspended by the California State Athletic Commission.

Sonnen claimed he had used the testosterone for medical reasons, but since he had not cleared the use with the CSAC, his was still punished, getting suspended 6 months and fined $2,500.

Nick Diaz

One of the baddest dudes in MMA, Nick Diaz had already made a name for himself in the UFC before he fought top-ranked lightweight Takanori Gomi at Pride 33.

The fight quickly became one of the best of all time, as both men battled on the feet before Diaz submitted Gomi via Gogoplata in the second round.

After winning the biggest fight in his career, Diaz was found to have tested positive for marijuana and the CSAC decided that it had affected his performance in the fight, declaring the fight a 'no contest' and fining Diaz $3,000.